diff --git a/src/wp-includes/post-functions.php b/src/wp-includes/post-functions.php
index c4640d5fe7..04f888a055 100644
--- a/src/wp-includes/post-functions.php
+++ b/src/wp-includes/post-functions.php
@@ -5081,11 +5081,16 @@ function wp_mime_type_icon( $mime = 0 ) {
 		$matches['default'] = array('default');
 
 		foreach ( $matches as $match => $wilds ) {
-			if ( isset($types[$wilds[0]])) {
-				$icon = $types[$wilds[0]];
-				if ( !is_numeric($mime) )
-					wp_cache_add("mime_type_icon_$mime", $icon);
-				break;
+			foreach ( $wilds as $wild ) {
+				if ( ! isset( $types[ $wild ] ) ) {
+					continue;
+				}
+
+				$icon = $types[ $wild ];
+				if ( ! is_numeric( $mime ) ) {
+					wp_cache_add( "mime_type_icon_$mime", $icon );
+				}
+				break 2;
 			}
 		}
 	}
diff --git a/tests/phpunit/tests/post/attachments.php b/tests/phpunit/tests/post/attachments.php
index 7633fd1f89..7459c6ae4c 100644
--- a/tests/phpunit/tests/post/attachments.php
+++ b/tests/phpunit/tests/post/attachments.php
@@ -512,9 +512,9 @@ class Tests_Post_Attachments extends WP_UnitTestCase {
 
 		$upload = wp_upload_bits( basename( $filename ), null, $contents );
 
-		$this->assertNotEmpty( $upload['error'] );
-
 		remove_filter( 'upload_mimes', array( $this, 'blacklist_jpg_mime_type' ) );
+
+		$this->assertNotEmpty( $upload['error'] );
 	}
 
 	public function whitelist_psd_mime_type( $mimes ) {
@@ -526,4 +526,22 @@ class Tests_Post_Attachments extends WP_UnitTestCase {
 		unset( $mimes['jpg|jpeg|jpe'] );
 		return $mimes;
 	}
+
+	/**
+	 * @ticket 33012
+	 */
+	public function test_wp_mime_type_icon() {
+		$icon = wp_mime_type_icon();
+
+		$this->assertContains( 'images/media/default.png', $icon );
+	}
+
+	/**
+	 * @ticket 33012
+	 */
+	public function test_wp_mime_type_icon_video() {
+		$icon = wp_mime_type_icon( 'video/mp4' );
+
+		$this->assertContains( 'images/media/video.png', $icon );
+	}
 }